Flood

Service in charge of predicting hazardous situations caused by heavy floods, in partnership with Météo-France. The flood forecasting Service (SPC) warns the Prefect in case of alarm and prepares the information to be disseminated to the mayors. The Civil Protection Service of the prefecture is in turn responsible for alerting the mayors by suitable means and providing them with the information developed by the

A mark showing the historical floods of a river. Witness to the great past floods, flood markers allow to keep the memory of floods that time or trauma can sometimes erase. They come in different shapes (line or mark on stone, metal plate or sealed flat button, etc) and are found on different types of buildings (public or private buildings, wharves, piers of bridge, etc).

Fast or slow submersion of facilities or homes due to groundwater or surface water overflowing during flood or runoff caused by rainfall.

Mapping of the surface area flooded by a significant high water level that allows keeping record of the largest floods.

Mapping of the surface area that would be flooded by high water levels modelled for each frequency (10-year to 100-year floods) or determination by a hydro-geomorphologic method of homogeneous spatial units modelled for different types of floods. The Atlas of floodplains thus represent potential flood-prone areas having (or not) been flooded by a known high water level.